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Finding the Fourth Proportional to 155.18, 232.66 and 78.11

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Solution

The fourth proportional to 155.18, 232.66 and 78.11 is: 117.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.18 : 232.66 = 78.11 : x
  2. Step 2: Convert to fraction form
    155.18/232.66 = 78.11/x
  3. Step 3: Cross multiply
    155.18x = 232.66 × 78.11
  4. Step 4: Simplify right side
    155.18x = 18,172.88
  5. Step 5: Solve for x
    x = 18,172.88/155.18
  6. Step 6: Final answer
    x = 117.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.